Google Sheets Subscribe questions

Hello all,

I'm trying to use the Google Sheets Subscribe snap, and either I misconfigured something, or my expectations about the results are wrong.

I can subscribe successfully to a Google Sheet, and my expectation is to get a call sent to my triggered task with the changes that were made by users in the Google Sheet document.

After my test, I saw only empty messages sent to my triggered task, so it seems like I'm only receiving a "ping" when there is a change in the document. Is this expected, or am I supposed to get a summary of the change?

Also I'm wondering why there is an expiration for the Google Sheet subscription? How am I supposed to do if I want to monitor the document permanently?

Thanks!

JF